The identification of CTA 21

Details The identification of CTA 21 The identification of CTA 21

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982japa....3..189a&link_type=abstract

Journal of Astrophysics and Astronomy, vol. 3, June 1982, p. 189-192.

Astronomy and Astrophysics

Astronomy

5

Extragalactic Radio Sources, Infrared Astronomy, Infrared Spectra, Radio Spectra, Bl Lacertae Objects, Infrared Spectrophotometers, Radio Galaxies

Scientific paper

The discovery at infrared wavelengths of the counterpart of CTA 21 shows an unusual spectral shape. Measurements were made in the J, H, and K bandpasses (1.20, 1.64, and 2.19 microns) using an infrared photometer-spectrometer on the 3.9 m Anglo-Australian Telescope. An object M was located at 6 arcsec east and 8 arcsec north of the radio position of CTA 21, and a partial map of the region confirmed that an infrared source rests at the position (relative to M) appropriate to CTA 21 to within an uncertainty of approximately 1.5 arcsec. CTA 21 is thus identified, and it is determined that it may be BL Lac object, but with two unusual breaks in the electromagnetic spectrum. To continue this study, further infrared measurements and millimeter wavelength data will be useful.

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